From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Suitability of different shock dampers for various driving conditions and chassis types.
| Identifier | WestWitteringFiles\Q\April1927-June1927\ 43 | |
| Date | 29th April 1927 | |
| TO BJ. FROM R.{Sir Henry Royce} Copy to GY. " HS.{Lord Ernest Hives - Chair} " BY.{R.W. Bailey - Chief Engineer} SHOCK DAMPERS. X832/Y235 44426 Regarding shock dampers our double acting hydraulic ones certainly give the best riding qualities to the car, but as they were only designed for the front axle movement they are scarcely large and robust enough for high speed service onthe back axle. We are therefore at the moment fitting Hartfords in addition, and these can be left free, or tightened, in accordance with the duty the car is asked to perform. This extra shock damping is necessary for the high speeds and rough roads of France, whereas it is undesirable for a town carriage. On the American chassis I notice it is fitted with Lovejoys on the rear, and these appear to only have a 10" arm, whereas we cannot fit anything less than a 13" arm to the rear shock damper. Either Springfield or ourselves are wrong, or the conditions under which the cars run are quite different. R.{Sir Henry Royce} | ||